The problem is that PDF has already had a few cycles of adding and then shedding off useless, and frankly, dangerous ideas because they keep trying fit a square peg in a round hole.
Exactly, and this feature could encourage more people to use PDFs in context where they should not really be used, because of having a false sense of security that their document will somehow magically be reflowed on devices that it wasn't authored to display on.
That may be, but it still has no real relevance to this article unless people just want any excuse to get on their soapbox to rant about Adobe/PDF without even bothering to read the article and what it is talking about.